Document and Entity Information - USD ($)
12 Months Ended
Jan. 30, 2016
Apr. 08, 2016
May. 02, 2015
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 30, 2016    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Trading Symbol OLLI    
Entity Registrant Name Ollie's Bargain Outlet Holdings, Inc.    
Entity Central Index Key 0001639300    
Current Fiscal Year End Date --01-30    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   59,954,240  
Entity Public Float     $ 0